Detective conan- on like 688 episodes now, I can't even remember where I stopped and what the overarching plot was like

Me too on this one. I had TVJapan for years but then cancelled it when Detective Conan was the only show I watched on it; for $25/month it wasn't worth it for one anime. But that was years ago so I have missed from episodes 591 or so on so I am like 100 episodes behind LOL

One Piece. Last time I watched it, I dropped it early in the Arlong arc. The Baratie arc alone was too long and I got the feeling that the rest of the series was the same way. I don't know which anime has worse padding: OP or DBZ (Kai notwithstanding). This was nearly three years ago. Haven't picked OP back up since.